Abstract
In the present work, we propose a novel modulation scheme for 5G wireless communication system. Our contribution is to combine PM-OFDM (Phase Modulation Orthogonal Frequency Division Multiplexing) and CDMA (Code Division Multiple Access) to exploit their distinctive advantages. On the one hand, PM-OFDM is an effective technique to combat multipath fading effects. On the other hand, CDMA can serve multiple users who are using the same resources of time/frequency. The aim is to make a combination of PM-OFDM and CDMA techniques. In this paper, the OFDM-CDMA scheme and its PAPR (Peak-to-Average Power Ratio) statistics are reviewed. In this paper, the proposed scheme PM-OFDM-CDMA is described and its performances in terms of PAPR, power spectral density, and BER (Bit Error Rate) are analyzed. Moreover, MMSE (Minimum Mean Square Error) equalizer is used to avoid multipath and noise effects simultaneously. The simulation through AWGN (Additive white Gaussian noise) and Rayleigh channels is performed using MATLAB. From the simulation results, we observed that PM-OFDM-CDMA is an efficient technique in terms of energy consumption (PAPR = 0dB). Besides, CE-OFDM-CDMA offers high spectral efficiency with low BER due to its low PAPR. In CE-OFDM-CDMA method, the shape of the spectrum varies according to the value of the modulation index h. The band occupied by the spectrum increases with the value of h. Therefore, CE-OFDM-CDMA could be considered as a suitable technique for 5G applications.
Highlights
OFDM signals suffer from a high PAPR (Rajasekaran et al, 2019)
After building the Matlab model of the proposed PM-OFDM-CDMA transceiver, we have evaluated the performance of PM-OFDM-CDMA
In PM-OFDM-CDMA method, the shape of the spectrum varies according to the value of the modulation index
Summary
Technology has made huge steps, especially in the field of the development of mobile electronic devices. If any additional power is not injected in Input, OFDM suffers from spectral widening which causes by the non-linear component of the transceiver (Singya et al, 2017) This problem limits the performance of the OFDM system especially in the case of battery-powered wireless systems. The phase modulator has the advantage of producing a modulated signal with the lowest possible PAPR (0 dB) In this case, the PA can be used efficiently in the transmission chain based on the OFDM system. 2. Related Works A comparison between several 5G waveforms, such as OFDM, UFMC, FBMC, and GFDM, is made in terms of power spectral density, PAPR, and robustness of multi-user asynchronous uplink transmission (Gerzaguet et al, 2017). The problem of multipath is reduced by introducing redundancy codes
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